Reynolds Number Calculator

Calculate the Reynolds number to predict flow regime (laminar vs turbulent).

Flow Parameters

Use consistent units (e.g. SI)

Fluid Density (ρ)

Flow Velocity (v)

Characteristic Length (L) (Diameter for pipe)

Dynamic Viscosity (μ)

Reynolds Number

Enter fluid properties

About this calculator

Quick Reference

ρDensity

vVelocity

LCharacteristic Length

μDynamic Viscosity

Overview

The Reynolds number is a dimensionless quantity in fluid mechanics used to help predict flow patterns in different fluid flow situations.

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Pro Tips

Fun Facts

Formula: Re = (ρvL) / μ